Radio dial control



H. R. HAYDEN Jail. 27, 1931.

RADIO DIAL CONTROL Filed Nov. '18, 1929 m 0 I 55 H n -t- 5!!! w INVENTORm ATTORNEY 50 is' visible in the dark.

Patented Jan. 27, 19 31 PATENT. OFFICE l moan alumina, or Bnooxmm, m wYORK thereon and cooperating with the pointer' for indicating tlfeposition of adjustment. One object of the present invention is toprovide an improved dial control comprising a 1, plurality of dials ordial indicators upon which may bamarked indicia ofdifferent kinds.These'indicia may comprise part indications of angular adjustment of thecondensers in. egrees of are or in the wave length or frequ ncy ofincoming signals as well as the call letters of diflerent broadcastingstations As there are many diflerent broadcasting stations in operation,and the particular stations received .will generally 35 depend to alarge extent on the particular locality in which the receiving set is-.used I v a provide a means whereby the call letter indications may bereadily applied to or removed from one of the dials or indicators. Inthe particular embodiment of my invention herein disclosed I emplo aplurality of dials, one of which is prefera lya drum dial located back'of the panel or outer wall of. the receiving set cab net. A second dialemployed which is preferably located outside the'front panel or in sucha position that call letters of difierent broadcastin .stations' orother position indicators which 1t may be desirable to change, maybereadil a plied to and removed from this vdial. provide suitable meansfor moving the several dials proportionately so that each will give thecorrect indication at all positions of adjustment.

The dials cooperate with pointers or la'r arts for indicating theadjustment and I pre erably mark the mdicia on the dials or mark thepointers, or both, with luminous paint so that the adjusted positionindication be formed RADIO DIAL CONTROL Application filed ll'ovember 18,1929. Serial No. 407,881.

Other objects and advantages of my invention will appear from thefollowing descripi v Figure 3 is an elevation of the structure shown inFigure I viewed from the back of the radio cabinet panel, and

Figure 4 is a diagrammatic view showing a modified operatin means formoving giais, particularly or moving therexternal 1a a V ReferringtoFigures 1 to 3 of the drawing reference character 10 represents thefront' wall or 'panel of a radio receiving cabinet and 11 a face orescutcheon plate secured to the I .panel 10 by screw bolts 13. Bolts 13extend the through and serve to secure to 'the back of the panel 10 arear supporting plate 16. Se cured to the extend inwar y from the platead carry on their inner ends the rotatable drum dial 22. Dial 22 ismarked around its periphery, pref erably with luminous paint, withgraduations 24, a portion of which are visible through a window 26' inthe escutcheon plate 11 The side walls of the window 26 are formed withinwardly extending projections 27 which form pointers adapted tocooperate with graduations on the drum dial 22 to indicate the positionof this dial. Formed on the outside of the front plate .ll is an arcuateportion 30 which forms a stationary d al. This dial ma be marked withgraduations in any desire manner and means is provided whereb differentbroadcasting stations may be aplate 16 are brackets 20. which callletters of plied to any point of the dial or removed arcuate portion 30may be formed along its length with a surface which may be easily amarked and from which the marks may be easily erased or, if desired,such portion may as a holding frame of stamped sheet metal formed withan opening along one edge into which frame may he slipped at any desiredpoint a label or stri printed with the broadcasting station 0 letters.Such label would ordinarily have an arrow or similar mark printedthereon so that the label may be accurately positioned along thearcuate, portion 30. I have indicated'at 32 the call letters of twobroadcasting stations.

Adapted to cooperate with the stationary dial is a pointer 33 which isshown as an arm secured to a shaft 34 extending through the plate 11,panel 10 and plate 16, this shaft 7 I being rotatably mounted in abearing sleeve or bushing 36 also extending through the plates 11 and 16and panel 10.

For the purpose of moving the drum dial 3 22 and the pointer -33 so thateach will indi- .way around the periphery and up cate the correctposition'of the tuning condensers or other parts to be adjusted, Iprovide a hand knob 38 secured to a shaft 40' in any suitable manner asby a screw 42. Shaft 40 is rotatablymounted in a bearing bushing 41 asshown which extends through 5 plate 11, panel 10 and plate 16 and shaft40 carries at its inner end a small pulle 43 which is spaced from theinner end of the bushing 41. Also secured to the shaft 40, between thepulley 43 and the inner end of the bushing 41 is a small gear wheel orpinion 44. p

The shaft-40 serves to drive the drum'22 by means of a cord or belt 45which passes around the pulley 43. One end of the cord 45 is secured tothe interior of the drum 22 as by means of an eyelet 48. From the eyelet48 the cord passes through anopemng 49 in the periphery of the. drum,thence part over a guide pulley 50 rotatably mounte on the rear plate16, thence downwardly beneath a similar pulley 51 rotatably mounted onthe rear plate 16- at one side of the ulley' 43, thence around thepulley 43 and neath a guide pulley 53, thence around a portion of theperiphery of the drum 22 through an opening 54 in the periphery of thedrum to the eyelet 56 to which this end of the cord 45 is secured. Itwill be apparent from the showing in Fi es 2 and 3 of the drawing thatrotation o the pulley 43 in one direction or the other by means of thehand knob'38 will serve to rotate the drum dial 22 until the openings 49or 54in the drum are brought into a position substantially in the planeof the pulleys, this position of the drum 22 being the limiting positionof adjustment.

Mounted on the inner end of the shaft 34 is a relatively large gearwheel '60 which meshes with and is adapted to be turned by the pinion44, the gear 60 and pinion 44 thus serving as an operating connectionbetween the hand knob 38 and the pointer 33.

It will of course be understood that the relative diameters of thepulley 43, drum 22 and the gear wheels 44 and 60 will be such that asthe drum 22 moves completely over the desired range of movement, thepointer 33 will move over the entire length of the dial 30. Inasmuch asthe pulley 43 is of relatively small diameter motion of the knob 38 willimpart a relatively slow motion to the indicators thus providing for aso-called Vernier adjustment. l

It is apparent that other means ma be employed for operativelyconnecting t e dials to the operating knob or handle 38, thus in certaincases I may employ gearing between the knob 38 and the dial 22 as wellas between the knob and pointer 33.

In Figure 4 I show a modified driving means for the drum 22 and pointer33 wherein the cord or belt which serves as-a driving means for the drum22 also serves as a driving means for the pointer 33. For this purposeinstead of employing the gear wheel 60 at the inner end of the shaft 34I mount on the inner end of this shaft a pulley or drum 65.

The cord45 in its passage from pulley 53 to the drum 22 passes over thepulley 65 and I secure the cord 45 to the pulley 65 so that there willbe no chance of slipping between the cord and pulley 65.

It will be clear from the construction illus- ,trated in Figure 4 thatthe extent of motion of the drum 22 will always bear a certain relationto that of the pointer 33 and possible slipping of the cord 45 on thedriving pulley 43 will not interfere with the correct positioning of thedrum dial and pointer. In the connection shown in Figure 4 I may omitthe ulley 53. e

I desired I may provide a second knob on the outer end of shaft 34 so asto provide for a coarse adjustment as well as the fine adjustmentsecured by the knob 38. If desired either one or both of theseknobs maybe normally disconnected from their respective shafts but adapted to beclutched to the shafts by pressing inwardl on the knob.

From the construction s own in Figures 1 and 2 it will be readily seenthat the several moving parts of the control as well as the supportingplates 11 and 16 maybe readily removed from and applied to panel 10 ofthe casing or cabinet.

Having now descrlbed my invention, what I claim and desire to secure byLetters Patresponding to movement of the other over the range of theother, being one revolution or less.

2.v In a dial control for radio receiving systems, a panel having anopening therein, a drum located behind said opening having indiciathereon visible through said opening, a stationary dial' locatedoutsidesaid panel, said dial having other indicia thereon, a; pointercooperating with said dial and means for moving proportionately, saiddrum and pointer, the drum and pointer each having a range of movementover their respective indicia and the range of each corresponding tomovement of the other over the range of the other, being one revolutionorless.

3. In a dial control for radio receiving systems, a panel having anopeningtherein, a drum located behind said panel and having graduationsthereon visible through said opening, a dial occupying a plane parallelto that of said panel and having call letters of broadcasting stationsthereon, a pointer cooperating with said dial and a common means formoving said drum and proportionately moving said dial and pointerrelative to oneanother. 4.. In a dial control for radio receivingsystems, a casing having an opening therein, a drum dial located in saidcasing, a stationary pointer cooperating with said dial, a second dialoutside said casing, a second pointer movable over said second dial, andmeans for moving said drum dial and second pointer proportionately, saidsecond dial having call letters of-broadcasting stations removablypositioned thereon.

5. In a radio receiving system control, a plurality of dial indicatorshaving indicia of different kinds on the respective indicators,

and means for moving the indicators rela-- tively and proportionately toone another, said means including a cord for operating one of theindicators and a non-slip operating connection between the indicators.

6. Ina radio receiving system control, a

plurality of rotary dial indicators having indicia ofdifierent kinds onthe respective or less.-

indicators, a knob and motion reducing connections' between the knob andindicators for moving the indicators relatively and proportionately' toone another, said indicators each having irrange'of movement over theirrespective indicia and the rangeof each corresponding to the movement ofanother over the range of s'aid other, being one revolution 7. Ina'radioreceiving system control, a face plate having an o ring therein,a drum dial located behind said opening and having indicia thereonvisible through said opening, a' stationary dial on said face late be-'neath said opening, a movable pointer rotatably mounted on a said faceplate and tive to one another.

8. In a dial control for radio receiving systems, a panel having anopening therein, a-

drum located behind said panel and having indicia thereon visible in thedark through said opening, a stationary dial having indicia visible inthe dark thereon, a pointer visible in the dark adapted to cooperatewith said dial and. means for rotating said drum and for rotating saiddial-and pointer rela- 9. In a radio receiving system control, a

plurality of dials a common means for moving said dials, said meanscomprising a cord connected to said dial and means permitting a coarseand fine adjustment of said dials, said last named means comprisingpulleys of different sizes for moving said cord. 7

10. In a radio receiving system control, a' plurality of rotaryindicators, pulleys se cured to said indicators, a belt passing oversaid pulleys and permanently secured to each pulley, and meanspermitting a fine adjustment of said indicators, said means comprising asmall pulley over which said belt passes. 4

11. In a dial control for radio receivingsystems, a panel having anopening therein, a drum located behind said panel and having graduationsthereon visible through said opening, a dial in front of said' panel andhaving call letters of broadcasting stations thereon, a rotary pointercooperating with said" dial, a pulley secured to said rotary pointer, apulley secured to said drum, an operating pulley, abelt assing over saidpulleys and secured to sai' first named pulleys, said pulleys and beltbeing located behind said panel andineans' extending through said panelfor operating said lust named pulley.

Signed at New-York city, in the county of HAROLD R. HAYDEN.

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